Steam plant



Y proceeds.

Patented' Aug. 18, 1925..

UNITED STTES 1,550,097 PATENT OFFICE.

:ronaivims ntr'riss, or nmnsnorm, AND NILS manna, or STOCKHOLM, swnnnn, assrenons "r0 axrmnomen'r varonacxununaros, or s'rocxnow, swnnnn.

STEAM Application filed July .11,

To all whom it mag concern:

Be it known that we,.Jo ANNEs Burns and NILS FRENNE, subjectsof the'King of Sweden, residing at,,respectively, Torgardsviigen' 10', Djursholm, Sweden, and Skeppareg'atan 7 0, Stockholm, Sweden, have instored to steamleaving .asteam storer, the

arrangement being such, that a substantially uniform temperature of superheated steam is obtained.

The "invention further contemplates 'a novel means for superheating steam discharged from a steam storer. Further objects will be apparent as the description In general terms, the invention consists of the combination with a steam storer of a second storer acting as a superheater which is arranged to receive and superheat steam discharged from the steam storer and com: prising a conduit surrounded by heat storing material, heated by "gases from a primary steam generatonor an independent fire or the like means.

The invention is illustrated by means of the accompanying drawing, in which Fig, 1 shows one form of the invention comprising a boiler supplying steam to a steam storer which discharges steam. to a second storer acting to superheat the discharged steam, the second storer being arranged in the flue gas passage of the boiler; Fig.2 shows. a somewhat similar arrangement in which the second storer is independentlyfired; Fig.3 shows the two storers of Fig. 2

arranged between stages of a motor.

, In Fig. 1, o desi nates a steam boiler of any type and fire in any manner. The

boller supplies steam through conduit ;0 to

a steam storer g, equipped with non-return valves 9' and tend operating, in known manner, to absorb, store and reject steam so that the boilers of a plant may be operated indeendently of steam consum tion. Steam discharged from storer q is is through COllrduit a which passes into the boiler flue gas rLAn'r.

1923. Serial No. 650,978.

passagesand is surrounded by heat storing the point of use.

The superheat storer may be constructed in many ways, the form shown in Fig. '1 consisting of a series of loops of pipe, surrounded by cast iron. Blocks made in this manner may be arranged in various Ways. By forming a superheaterin this manner, a more uniform superheat of steam is obtained than with the customary arrangements which do notcomprise means for storing heat and this arrangement is particularly adaptable to steam storers, since their steam discharge is usually at a greatly varying rate. When a small amount of steam is discharged from the steam storer, the superheat storer absorbs heat and, in turn, gives up this heat to the discharging steam when the discharge is at increased rate.

In the embodiment shown in Fig. 2, the

superheater l isin the form of'an independently fired receptacle containing a liquid heat storing material 6. Heat is supplied by a fire, the gases of which pass through heating flue g. The steam space of the receptacle is a conduit extending through-the same and preferably comprising a coil 8. wound helically around heating flue g. Coil 8 receives steam from conduit u as in Fig. 1

and discharges superheated steam to use.

7 The heat storing material 7) maybe of various kinds. .It may be molten metal, in which case a' metal is preferably chosen which has a melting point lying within the working range of ten'iperature so that the heat of fusion is used for storage of heat. It may be a liquid salt solution.

In-Fig. 2, the steam passing from the boiler 0 is shown as being superheated by an ordinary superheater w.

The arrangement shown in Fig. 3, in which the steam storer and superheat storer are arranged between the high and low pressure stages of a turbine, gives exceptionally great advantages.

Steam generated in boiler o is su )plied to the high pressure stage E of a turbine, from which stage it passes into steam storer I]. Steam discharged from storer q passes through superheat storer Z and thence to low pressure stage F. The turbine is'shown as condensing, being equipped with condenser G, and as driving a load consisting of electric generator D. By this arrangement all the steam passing to the low-pressure stage can be superheated, the efficiency of the turbine increased and-much greater fluctuations of load equalized than without the superheat storer.

What we claim as new and desire to secure by Letters Patent in the United States of Americais 1. In a steam plant including a boiler and a storer the storer having a 'steamand Waterspace and being adapted to flash steam on drop of pressure, the combination with a second storer, means to heat the second v storer, the second storer consisting of a steam conduit surrounded by. heat storing material, said conduit being supplied with steam from the first mentioned storer, the said heatstoring material being of suflicient quantity so that a substantially uniform temperature of superheated steam is obtained therefrom.

2. In combination, a motor having a high pressure stage and a low pressure stage, a steam storer, means to conduct steam from the high pressure stage to the storer, a superheater comprising a-receptacle, a liquid in said receptacle whereby said superheater functions as a storer for heat, means to heat said receptacle and a steam conduit extending through said receptacle, means to conduct steam from said steam storer to said superheater, and means to conduct steam from said superheater to said low pressure stage, thereby obtaining a uniform temperature of steam for the low pressure stage.

3. In combination, a motor having a high pressure stage and a low pressure stage, a steam storer, means to conduct steam from the high pressure stage to the storer, a superheater comprising a receptacle, a metal in said receptacle having a melting point such that the heat of fusion is used for storage of heat, and a steam conduit ex-- tending through said receptacle, means to conduct steam from said steam storer to said super-heater, and means to conduct steam from said su-perheater to said low pressure stage.

at. In combination, amotor having a high pressure stage and a low pressure stage, a steam storer, means to conduct steam from the high pressure stage to the storer, a superheater comprising a receptacle, a liquid in said receptacle whereby said superheater functions as a storer for heat and a steam conduit extending through said liquid, means to conduct steam from said storer to said superheater and means to conduct steam from said superheater to said low pressure stage.

5. In combination, a motor having a high pressure stage and a low pressure stage, a steam storer, means to conduct steam from the high pressure stage to the storer, a super-heater comprising a receptacle, a liquid in said receptacle whereby said superheater functions as a storer for heat, a heating flue extending through said receptacle and a steam conduit extending through said liquid, means to conduct steam from said steam storer to said superheater, and means to conduct steam from said superheater to said low pressure stage.

6. In combination, a motor having a high pressure stage and a low pressure stage, a steam storer, means to conduct steam from the high pressure stage to the storer, a superheater comprisingta receptacle, molten metal in said receptacle whereby said superheater functions as a storer for heat, a heating fluid extending through said receptacle and a steam conduit extending through said molten metal, means to conduct steam from said steam storer to said superheater, means to conduct steam from said super-heater to said low pressure stage.

7. In combination, a motor having a high pressure stage and a low pressure stage, a steam storer, means to conduct steam from the high pressure stage to the storer, a superheater comprising a receptacle, a liquid in said receptacle whereby said superheater functions as a storer for heat, a line extending through said receptacle and a steam conduit surrounding said flue, means to conduct steam from said steam storer to said superheater and 'means to conduct steam from said superheater to said low pressure stage.

8. In combination, a motor having a high pressure stage and a low pressure stage. a steam storer, means to conduct steam from the high pressure stage to the store-r, a superheater comprising a receptacle, a molten r metal in said receptacle whereby said superheater functions as a storer for heat, means to heat said receptacle and a steam conduit extending through said receptacle, means to conduct steam from said steam storer to said superheater, and means to conduct steam from said superhcater to said ion pressure stage.

In testimony whereof we afiix our signatures.

JOHANNES llli'll Eh. NILS FRENNE. 

